| Name | Castor (AH) |
| YoB | 1909 |
| Sex | horse |
| Colour | bay |
| Sire | Iquique (US), 1891 |
| Dam | Gagara (Gahara) (RU), 1900 |
| Damsire | |
| Breeder | Oswald Veth |
| Birthplace | Sternberg, Mähren (Šternberk, Èeská republika) |
| Castor (AH), 1909 | Iquique (US), 1891 | Clay (US), 1879 | Electioneer (US), 1868 |
| Maid of Clay (US) | |||
| Effie (US), 1882 | Abdallah Mambrino (US), 1870 | ||
| Emma P. (US) | |||
| Gagara (Gahara) (RU), 1900 | |||